What are some alternatives?
When comparing Whimsical Mind Maps and MindNode, you can also consider the following products
Mind Map by RealtimeBoard - More than your average mind map
XMind - XMind is a brainstorming and mind mapping application.
Iris - The fastest web framework for Go in (THIS) earth
MindMeister - Create, share and collaboratively work on mind maps with MindMeister, the leading online mind mapping software. Includes apps for iPhone, iPad and Android.
Transno - Only one tap transforms a note to mind map
FreeMind - FreeMind is a premier free mind-mapping software written in Java.